iwlwifi: pcie: Refactor iwl_rxq_space
iwlwifi: pcie: Refactor iwl_rxq_space

Simplify iwl_rxq_space to improve readability and reduce
the ambiguity spares to a single element.

Signed-off-by: Ido Yariv <9bf660e90dbb8f09e938a5703dac0e6c6d0031d5@wizery.com>
Signed-off-by: Johannes Berg <bff32994ff0f8d048f262a8388145a71b6071bfe@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs